The BAHAMAS project: effects of dynamical dark energy on large-scale structure

被引：11

作者：

Pfeifer, Simon ^{[1
]}

McCarthy, Ian G. ^{[1
]}

Stafford, Sam G. ^{[1
]}

Brown, Shaun T. ^{[1
]}

Font, Andreea S. ^{[1
]}

Kwan, Juliana ^{[1
]}

Salcido, Jaime ^{[1
]}

Schaye, Joop ^{[2
]}

机构：

[1] Liverpool John Moores Univ, Astrophys Res Inst, 146 Brownlow Hill, Liverpool L3 5RF, Merseyside, England

[2] Leiden Univ, Leiden Observ, Pob 9513, NL-2300 RA Leiden, Netherlands

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2020年 / 498卷 / 02期

基金：

英国科学技术设施理事会; 欧洲研究理事会;

关键词：

cosmology: cosmological parameters; cosmology: dark energy; cosmology: large-scale structure of Universe; MATTER POWER SPECTRUM; BARYON ACOUSTIC-OSCILLATIONS; COSMIC STRUCTURE FORMATION; ACCURATE HALO-MODEL; GALAXY FORMATION; MASSIVE NEUTRINOS; QUINTESSENCE MODELS; BLACK-HOLES; COSMOLOGY; IMPACT;

D O I：

10.1093/mnras/staa2240

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this work, we consider the impact of spatially uniform but time-varying dark energy (or 'dynamical dark energy', DDE) on large-scale structure in a spatially flat universe, using large cosmological hydrodynamical simulations that form part of the BAHAMAS project. As DDE changes the expansion history of the universe, it impacts the growth of structure. We explore variations in DDE that are constrained to be consistent with the cosmic microwave background. We find that DDE can affect the clustering of matter and haloes at the similar to 10 per cent level (suppressing it for so-called freezing models, while enhancing it for thawing models), which should be distinguishable with upcoming large-scale structure surveys. DDE cosmologies can also enhance or suppress the halo mass function (with respect to Lambda cold dark matter) over a wide range of halo masses. The internal properties of haloes are minimally affected by changes in DDE, however. Finally, we show that the impact of baryons and associated feedback processes is largely independent of the change in cosmology and that these processes can be modelled separately to typically better than a few per cent accuracy.

引用

页码：1576 / 1592

页数：17

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